Scale data frame values to match share targets over any series

ip_shares_transform(datatable, target, series_start = "value",
series_target = "share", series_share_of = "share__of", sep = " + ")

## Arguments

datatable A data frame of values. A data frame of target shares over one or more dimensions. Should include an additional series to specify which series the shares are over. The name of the series in datatable to be compared to the target. The name of the target series containing shares. The name of the series in target specifying the series that are covered by the shares. Separator string to list multiple series in series_share_of.

## Value

A data frame of target values for use in freeze_slice in ip_fit.